Officejet Pro 7780 Won't Print Black

Only 1 year old.  Colors are okay, but I either get a horrible quality black or none at all.  Text and graphics affected.  It's not the ink cartridge, as I have replaced this.  Have also powered down/up, cleaned print jets, re-alinged, recalibrated linefeed, re-installed/updated driver and reflashed/updated firmware.  All to no avail.  Occasionally get a message that alignment is bad, and the alignmnet routine also gives me an error. In rare occasions (usually while prinitng from internet source), or faxes that arrive, the black is okay.  But these are exceptions.
Thanks.

Did you get any response to you query. My officejet pro, also just over a year, will not print the black ink. I have tried cleaning the print head - it juts gets worse, I have tried changing the print heads - but no difference. I have changed all the cartridges and then it goes mad and says they all need replacing. Now after switching off for a while it prints some black but has lines going through it. Surely the shelf life of these printers must be longer than a year! Any ideas?

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    If your problem is solved please click the "Accept as Solution" button ------------V
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    Please click the Thumbs up icon below to thank me for responding.
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    Please click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution.
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